Automatic brake control



1,646,306 R. L. MILTON AUTOMATIC BRAKE CONTROL Filed Jan. 1927 2Shets-$heet Hll Ill! lLMiZtbw INVENTOR ATTOR N EY Oct. 18,1927.

R. L. MILTON AUTOMATIC BRAKE CONTROL 2 Sheets Sheet 2 Filed Jan 1. 192 7 All/ 4 E. LMz'Zton ATTO R N EY Patented Oct. 18, 1927.

ROBERT Ii- MILTO or sT. anion, MINNESOTA.-

AUToMATIo BRAKE conTrton' Application filed January 31, 1927. Serial no. 164,921;

This invention relates to improvements in air brake systems for railway cars, an object being to provide means for automatically opening the air line so as to apply the brakes in theevent one orm'ore of the car trucks leave'thje rails.

Another object of the-invention is the provision of means of the above character which may be included in the system after the latterhas'been installed. I

Another object of the invention is the provision of an air valve of novel construction, designed to be included in theair line and normally closed, but which will be automa'tically opened by the jolting of the car should any of the trucks leave the rails.

With tli'eabo'veand other objects in View, the invention further includes the following novel features and details of construction, to be hereinafter more fully described, illustrated in the accompanying drawings and pointed out in the appended claims.

In the drawings: j Figure '1 is aside elevation showing a fragmentary portion of a railway car with the invention applied. I

Figure 2 is a top plan view of one sideof one of the trucks of a car.

Figure 3 is an enlarged longitudinal sectional View through the valve.

Figure 4 is a top plan view.

- Figure 5 is a section on the line 55 of Figure 3.

Referring to the drawings in detail wherein like characters of reference denote corresponding parts, the reference character 10 indicatesa fragmentary portion of a railway car, 11 one of the trucks and 12 the journal boxes at opposite ends of the trucks.

The valves which constitute part of the present invention are indicated generally at 13 and may be supported upon any suitable part of the car. The valves are preferably supported upon the journal boxes 12 and for this purpose are provided with brackets 14 which are secured to these boxes.

One of these valves is shown in detail in Figure 3 of the drawings and consists of a preferably cylindrical housing 14 which is provided with an air inlet port 15. A nipple, 16 is secured to the casing in communication with the port 15 with its opposite end coupled to a preferably flexible air pipe 17.

The pipe 17 is in turn coupled to a pipe 18 which receives air from the main air line. Any number of valves 13 may be provided,

but it is preferred to provide one of these valves at-each'cnd of the truck 211K121} eachcage 20, the latter having a thre'a'dedengage'-- ment 21'wit'h one end of the casing 14. The

disk. 19 is clamped between compressible gaskets'22 by means of a cap'23 which threadedly engages the adjacent end of the casing 14. Extending diametricallywithinthe cage 20 are-guide bars 24 and 25 which d are provided with openings for the-passageof an impact member which includes" a shank 26. A head2l' is carried by onee'nd'of the shank and is positioned adjacent the disk 19'- so as to strike and break the'disk as will be hereinafter apparent. The oppositeend of the shank 26 carries a relatively large head 28.

Freely movablewithin the casing 14 is a preferably spherical member 29 which is adapted to' be actuated by the jolting of the wheels ofthe car in the event the wheels should leave the rails; The ball in its movement-will contact with the head 28 of the impact 'memberand cause the head 27 to shatter the disk19 so as to bleed the air line and pplythe brakes.

-,'fhe member 29 -is normallySill upon a disk or platform 30 and located between this disk or platform and the adjacent end of the casing is a spring 31 which acts to force the member 29 in a direction toward the head 28. 'lhisspring is held under tension by the disk or platform 30 which has depending therefrom a yoke 32. This yoke is'slidable upon a bolt 33 whose threaded end extends through the casing and is provided with an adjusting nut 34. The tension of the spring may thus be regulated.

Should the wheels of any of the trucks of the car leave the rails, the consequent jolting will act to move the member 29 within the casing, which movement will be assisted by the action of the spring 31. The member 29 will thus contact with the head 28 and cause the head 27 to shatter the disk 19 as previously mentioned.

By removing the cap 23, a new disk 19 maybe positioned so as to againclose the valve. If necessary, the entire cage may be replaced, as well as the disk 19.-

The invention is susceptible of various 2. 111 an air brake system for railway cars,

anormally closed valve adapted to be eonnected in the air llne, a removable fragile closure for said valveand means included in the valve and operable by the bumping of the-carin the event the Wheels of the latter leave .therails, to act on said closure and open the valve. I a

3.. In an air brake system for railway cars, anormally closed valve adapted to be connected in the air line, said valve comprising a casing, a fragile closure for one end of the casing, a member mounted for longitudinal movement adjacent to and adapted to act. on. said closure to open the end of the cas ing and a member freely movable within the casing and operated by the bumping of the car to act on the longitudinally movable member should the car leave the rails.

iln an air brake system for railway cars, a normally closed valve adapted to be connected in the air line, said valve comprising a casing a fragile closure for one end of the casing, a member mounted for longitudinal movement adjacent to and adapted to act-on saidclosure to open the end of the casing and a member freely movable Within the easing and ope-rated'by the bum, ing-of the car to act on the longitudina 1y movable member should the car leave the rails and a spring actuated support for the freely movable member to assist in the operation of the latter. r

5. In an air brake system for railway cars, a normally closed valve adapted to be connected in the air line, a cage removably positioned at one end of the valve, a. fragile, disk mounted onthe cage to provide a closure for the valve, an impact member'slidingly mounted in and carried by the cagol to contact with the disk and break the latter;

to open the valve and meansincluded inthe valve and operable by the bumplng of the car inthe event the Wheels of the latter leave the rails, to act on said closureand open the valve.

6. In an air brake system for railwaycars,

a normally closed valve adapted to be con' nected 111 the airline, a cage removablypositioned at one end of the valve, a fragile disk mounted on the cage to provide a closure for the valve, an impact member slid ingly mounted in and carriedby the cage to contact with the disk and break the latter to open the valve, a member freely. movable within the valve for contact with the impact member to actuate the latter and spring means operable When thejwheels of the can leave therails to assist in the operation of the freely movable member. I a

In testimony whereof I allix my signature.

ROBERT L. MILTON. 

